Evaluation Of Shear Bond Strength Of Ceramic Brackets With Two Different Base Designs: An In-Vitro Study

Objectives: Ceramic brackets were introduced to satisfy the esthetic needs of the patient. The shear bond strength of the brackets is essential as it is important for bonding to enamel. The aim of the present study was to evaluate the shear bond strength (SBS) of ceramic orthodontic brackets with two distinctbase designs. Methods: This was a prospective in-vitro study conducted in Saveetha Dental College and Hospitals, Chennai, India. 50 extracted premolar teeth and two groups of ceramic brackets with bead ball base design and mushroom shaped groove base design were used. 25 samples of each type of brackets were bonded onto 50 premolar teeth which were extracted for orthodontic purposes. Bonding was done using Transbond XT adhesive under standardized bonding procedures. After 24 hours, the shear bond test was done using a Universal testing machine. Descriptive statistics and independent sample t-test were done to compare the SBS of the two different bracket types. Significance value was set as 0.05. Results: Mean shear bond strength of bead ball base brackets were 19.81 +/-3.81 MPa and mushroom shaped groove base brackets were 16.46 +/- 1.88 MPa. p-value < 0.01 was obtained as a result of the Independent sample t test. Conclusion: SBS of ceramic brackets with bead ball base design was significantly more than that of the ceramic brackets with mushroom shaped groove base design.SBS of both the types of brackets were clinically acceptable.